GlueX TOF Meeting, February 18, 2011
Contents
Location, Time
Friday, February 18, 2011
2:00 pm EST
JLab: CEBAF Center, Room F326/7
Agenda
- Announcements
- Minutes from the last meeting
- Report from trip to U. of South Carolina: Paul
- Prototype Status
- Contract Status
- TOF Schedule
- Meeting time OK?
Communication
Videoconference
- ESNet: 8542553
- EVO: EVO site
- direct meeting link
- Phone Bridge ID: 6 9368
Telephone
- dial:
- US and Canada: (866)740-1260 (toll free)
- International: (303)248-0285 (toll call) or look up toll-free number at http://www.readytalk.com/intl
- enter access code followed by the # sign: 3421244#
Slides
Talks can be deposited in the directory /group/halld/www/halldweb1/html/talks/2011-1Q on the JLab CUE. This directory is accessible from the web at https://halldweb1.jlab.org/talks/2011-1Q/ .
Minutes
TOF Meeting, 2/18
JLab: Mark, Tim, Sascha, Simon, Tim, Beni, Elton, Yi FSU:
Test says PMT is as advertised, better than intrinsic.
Trip to SC to see Ralf
• good trip, with sasha • goals ∘ on design choices, compare and contrast ∘ resolution not at goal ∘ ESR beneficial or not • went over their procedures • time-walk corrections ∘ sasha trying to fit all parameters at once ∘ sc using iterative approach, not letting all parameters float ∘ without time walk corrections, factor of two worse ∘ Elton 1/sqrt(ph) not the right functional dependence ∘ laser might have different spectral response • TDC's ∘ resolution from electronics get something like 55 ps, the least significant bit ∘ Ralf gets the same thing, lsb value, except 25 ps from his CAEN device ∘ Why not go to CAEN TDC. ∘ will get from Mark Kibilko ∘ readout protocol should be OK • PMT choices ∘ SC using 8 stage, not the 10 stage ∘ 10 stage tube perhaps not available • ESR ∘ improved light collection results from FSU ∘ SC had poorer performance with ESR ∘ material they were calling ESR, looks like white Tedlar, not specular ∘ Ralf had mylar that he could not use and gave it to Paul • tour of lab ∘ alignment devices ∘ glueing tools, jigs • Contract ∘ assembly and testing document
Geometry
• making the counters wider may lose light • mounting pmt directly on scint like SC attractive • has not finalized proposal yet • need to talk about it next time • outside diameter with mu metal 6 cm • sc using 6 cm x 6cm counters • current design with steel tube more than adequate
schedule
• tim shows one
• pmt kind of thing JLab would buy
• scint as well
• others bought by FSU
• contract has to be awarded PO goes out, 7 months from now
mu metal shield will be tested
rates for innermost paddles near the beam hole: how do we address that
get drawing from tim on
